(Reuters) - Tourism to Berlin is booming as never before and filling the debt-ridden city's coffers with much-needed cash, but not all Berliners are cheering the influx of visitors.

Some blame the tourists, especially the young 20-something "Easyjet set" who ride the budget airline to party through the night in the uber-cool, hedonistic German capital, for a host of ills from rising rents to noise pollution.

A gallery in an area known for its trendy bars featured for months a scrawled sign in the window: "Sorry, no entry for hipsters from the U.S."

"We've seen people insulted for looking like tourists or get disparaging looks," said David Schuster, an activist for a local leftist group that has launched a tourist-friendly awareness drive.

"There's some resentment that tourists party loudly or throw up on the streets," Schuster said. "I think many Berliners do too, but they feel entitled to act that way."

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Berlin, now Europe's third most visited city after the more established magnets London and Paris, can ill afford to scare away the tourists.

Tourism generated gross revenues of 10.3 billion euros last year, equal to nearly 10 percent of the city budget, a recent study by the Berlin government said. That is more than either real estate or consumer goods production, two other expanding branches of Berlin's otherwise plodding economy, it showed.

Nine new hotels are set to open by 2013.

Yet this summer, visiting investors at a business convention were attacked by some hundred demonstrators and a newly opened "organic hotel" was vandalized by anti-gentrification activists.

Something tells me they will be equally enthused to see beggared Spaniard hipsters flooding into Berlin, wielding their entitlement syndrome and another batch of suspicious-smelling cucumbers._________________Deja Moo: the feeling that you've heard this bull before